Question: Which Seyfert galaxy has the largest apparent magnitude?
Paraphrase: What is the brightest Seyfert galaxy as viewed from Earth?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q213930 . ?ent wdt:P1215 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: [UHD2015] 14, 2XMM J105045.9+571732, 2MASX J04055765+5418446, 2MASX J04055765+5418446, MRC 0000-160